MLA
Champomier, P. A. (Pierre Antoine), approximately 1794-. Statement of the sugar crop of Louisiana, of 1860-61 : with an appendix. 1861. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcgm3-cor.
APA, 6th edition
Champomier, P. A. (Pierre Antoine), approximately 1794-. (1861)[Statement of the sugar crop of Louisiana, of 1860-61 : with an appendix]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcgm3-cor.
Chicago
Champomier, P. A. (Pierre Antoine), approximately 1794-, Statement of the sugar crop of Louisiana, of 1860-61 : with an appendix, 1861, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcgm3-cor.